standardize and improve lookup rules for external local repos

diff --git a/cache.h b/cache.h
index 2e6ad3604e4cc6efd60a69407159967a1940e680..3dfb95d8aaf951763c5b889889c221b446f89a0e 100644 (file)
--- a/cache.h
+++ b/cache.h
@@ -432,6 +432,7 @@ extern char *git_work_tree_cfg;
 extern int is_inside_work_tree(void);
 extern int have_git_dir(void);
 extern const char *get_git_dir(void);
+extern int is_git_directory(const char *path);
 extern char *get_object_directory(void);
 extern char *get_index_file(void);
 extern char *get_graft_file(void);